MiSTer FPGA Forum

Hello,

I've bought my mister a while ago and it came with the LLAPI input device from bootsector. It works really but I'd like to try snac too (mainly because of the possibility to use a USB device too).

My questions are:

I've read that for some adapters like the mega drive one I need the last revision due to a lack of connections on older revisions. Is it possible to find a scheme to add those connections to my 5.5 I/O board?

How is possible that my actual LLAPI input device is working with a 6 button controller with my actual I/O board?

Thank you in advance

Sorry this doesn't really address your question, but ... What do you mean by "use a USB device too"?

SNAC uses the user serial port, which is physically a USB 3.0 connector, but it is not a functional USB port.

I'm sorry for the confusion, I meant the adapter for USB controller (serial port to USB):




EDIT:
OK I misread the functionality of SNAC I didn't notice that you need an adapter serial to usb and then add the usb adapter for the controller. I was thinking that using the serial to usb pcb it will allow to plug some usb controllers to the serial port of the mister..

Anyway the question regarding the I/O board mod to use all the required connection remains.

I compared the schemes of the 5.5 and 6.1 versions and I've tried to add IO6 signal and a pull up resistor for every serial signal:


Now I need a SNAC with the genesis adapter to test if it works.
The pull up resistors solved the flickering inputs with a relatively long USB 3.0 cable using LLOAD input device

One thing to keep in mind. SNAC adapters are moving to the HDMI connector, so SNAC and BLISS can use the same cables.

Finally I got enough components to assemble a USB snac and a couple of adapters (I'm still waiting PCBs for HDMI snac, PCE SNAC, cables, ports and some LLAMA adapters ) but I was able to test the mega drive PCB with a 6 buttons controller and I can confirm that the mod is working!